Table 1.

Baseline P _mean and f _H for embryonic White Leghorn chickens under control conditions and the ΔP _mean (kPa) within each embryonic age in response to either increasing doses of Ang II or a single injection of 1,000 ng/kg (1,000 s) in a separate group of chickens

Age	n	P mean	f H (min−1)	ΔP mean (kPa) Ang II Dose (ng/kg)
				100	250	500	1,000	2,000	1,000 s
13	6 (7)	0.78 ± 0.05	239 ± 3	0.12a	0.21ab	0.26bc	0.31c	0.41d	0.29c
17	8 (8)	1.94 ± 0.05	259 ± 3	0.21a	0.30a	0.46b	0.74c	0.89c	0.85c
19	8 (10)	2.31 ± 0.08	250 ± 3	0.23NS	0.44a	0.61a	0.99b	1.20b	1.08b
20	7 (6)	2.75 ± 0.07	268 ± 4	0.62a	0.86a	0.83a	1.59b	1.69b	1.32b
21	6 (6)	2.85 ± 0.10	287 ± 4	0.43a	0.96b	1.14b	1.69c	1.64c	1.56c

Different letters between pressure responses to the increasing doses of Ang II indicate significant (p < 0.05) differences in the response intensity within an age group. All ΔP _mean were significant (p < 0.05) unless noted by NS. The data are presented as mean ± SE. The number of embryos treated with a single injection of Ang II is indicated in parenthesis